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MIPS Kprobes: Refactor branch emulation

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This patch refactors MIPS branch emulation code so as to allow skipping
delay slot instruction in case of branch likely instructions when branch is
not taken. This is useful for keeping the code common for use cases like
kprobes where one would like to handle the branch instructions keeping the
delay slot instuction also in picture for branch likely instructions. Also
allow emulation when instruction to be decoded is not at pt_regs->cp0_epc
as in case of kprobes where pt_regs->cp0_epc points to the breakpoint
instruction.

The patch also exports the function for modules.

Signed-off-by: Maneesh Soni <manesoni@cisco.com>
Signed-off-by: Victor Kamensky <kamensky@cisco.com>
Cc: David Daney <david.daney@cavium.com>
Cc: ananth@in.ibm.com
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2913/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maneesh Soni
2011-11-08 17:07:11 +05:30
committed by Ralf Baechle
parent 9233c1ee71
commit d8d4e3ae0b
3 changed files with 91 additions and 46 deletions
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2
arch/mips/math-emu/cp1emu.c
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@@ -245,7 +245,7 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
*/
emulpc = xcp->cp0_epc + 4; /* Snapshot emulation target */
if (__compute_return_epc(xcp)) {
if (__compute_return_epc(xcp) < 0) {
#ifdef CP1DBG
printk("failed to emulate branch at %p\n",
(void *) (xcp->cp0_epc));